TNFR1 Protein

TNFR1 Protein

Introduction

Tumor Necrosis Factor Receptor 1 (TNFR1, also known as TNFRSF1A) is a member of the tumor necrosis factor receptor superfamily that transduces the pro-inflammatory and pro-apoptotic effects of tumor necrosis factor-alpha (TNF-α). TNFR1 is a master regulator of inflammation, cell survival, and cell death pathways. In the central nervous system, TNFR1 signaling contributes to neuroinflammation, excitotoxicity, and neuronal loss in Alzheimer's disease (AD), Parkinson's disease (PD), multiple sclerosis (MS), stroke, and traumatic brain injury. Understanding TNFR1's dual roles in both protective immunity and pathological neurodegeneration is crucial for developing targeted therapeutics.

Protein Infobox

<div class="infobox infobox-protein"> [@mccoy2007]
<div class="infobox-header">TNFR1 Protein</div> [@heneka2015]
<div class="infobox-row"><strong>Gene:</strong> [TNFRSF1A](/genes/tnfrsf1a)</div> [@sriram2075]
<div class="infobox-row"><strong>UniProt ID:</strong> [P19438](https://www.uniprot.org/uniprot/P19438)</div> [@chao2009]
<div class="infobox-row"><strong>PDB Structure:</strong> 1TNR, 1FVC, 2AZ5, 5US7</div> [@chen2007]
<div class="infobox-row"><strong>Molecular Weight:</strong> ~55 kDa (type I transmembrane protein)</div> [@montgomery2011]
<div class="infobox-row"><strong>Subcellular Localization:</strong> Plasma membrane, endosomes, Golgi apparatus</div> [@decourt2007]
<div class="infobox-row"><strong>Protein Family:</strong> TNF receptor superfamily, TNFR1 subfamily</div> [@roh2005]
</div> [@yang2012]

Structure

TNFR1 Protein

Introduction

Tumor Necrosis Factor Receptor 1 (TNFR1, also known as TNFRSF1A) is a member of the tumor necrosis factor receptor superfamily that transduces the pro-inflammatory and pro-apoptotic effects of tumor necrosis factor-alpha (TNF-α). TNFR1 is a master regulator of inflammation, cell survival, and cell death pathways. In the central nervous system, TNFR1 signaling contributes to neuroinflammation, excitotoxicity, and neuronal loss in Alzheimer's disease (AD), Parkinson's disease (PD), multiple sclerosis (MS), stroke, and traumatic brain injury. Understanding TNFR1's dual roles in both protective immunity and pathological neurodegeneration is crucial for developing targeted therapeutics.

Protein Infobox

<div class="infobox infobox-protein"> [@mccoy2007]
<div class="infobox-header">TNFR1 Protein</div> [@heneka2015]
<div class="infobox-row"><strong>Gene:</strong> [TNFRSF1A](/genes/tnfrsf1a)</div> [@sriram2075]
<div class="infobox-row"><strong>UniProt ID:</strong> [P19438](https://www.uniprot.org/uniprot/P19438)</div> [@chao2009]
<div class="infobox-row"><strong>PDB Structure:</strong> 1TNR, 1FVC, 2AZ5, 5US7</div> [@chen2007]
<div class="infobox-row"><strong>Molecular Weight:</strong> ~55 kDa (type I transmembrane protein)</div> [@montgomery2011]
<div class="infobox-row"><strong>Subcellular Localization:</strong> Plasma membrane, endosomes, Golgi apparatus</div> [@decourt2007]
<div class="infobox-row"><strong>Protein Family:</strong> TNF receptor superfamily, TNFR1 subfamily</div> [@roh2005]
</div> [@yang2012]

Structure

TNFR1 is a type I transmembrane receptor with characteristic features: [@dong2002]

• Extracellular domain (ECD): Contains four cysteine-rich domains (CRDs) that bind TNF-α
• Transmembrane domain: Single α-helical transmembrane segment
• Cytoplasmic domain (DD): Contains the death domain (~70 aa) for signaling
• Pre-ligand assembly: TNFR1 forms pre-assembled trimers in the membrane
• Soluble receptor: Can be shed as a soluble receptor (sTNFR1) that neutralizes TNF-α

Normal Function

TNFR1 signaling has complex physiological roles:

Role in Neurodegeneration

Alzheimer's Disease

TNFR1 is upregulated in AD brains and contributes to pathogenesis:

• Neuroinflammation: [TNF-α](/proteins/tnf-alpha-protein)/TNFR1 signaling drives chronic neuroinflammation in AD
• Synaptic dysfunction: TNFR1 activation impairs synaptic plasticity and memory
• Amyloid-β synergy: [Aβ](/proteins/amyloid-beta) and TNF-α synergistically promote neuronal death
• Glial activation: TNFR1 on [microglia](/cell-types/microglia-neuroinflammation) and [astrocytes](/entities/astrocytes) promotes pro-inflammatory phenotype
• Therapeutic targeting: TNF-α inhibitors (etanercept, infliximab) have shown promise in AD models

Parkinson's Disease

TNFR1 contributes to dopaminergic neuron loss:

• Mitochondrial dysfunction: [TNF-α](/proteins/tnf-alpha-protein) signaling through TNFR1 impairs mitochondrial function
• Microglial activation: TNFR1 mediates microglial activation and neurotoxic cytokine release
• [Alpha-synuclein](/proteins/alpha-synuclein): TNF-α potentiates α-synuclein toxicity
• Neuroprotection: TNFR1 deficiency protects against MPTP-induced PD

Amyotrophic Lateral Sclerosis

TNFR1 plays a role in motor neuron degeneration:

• Astrocyte activation: TNFR1 on astrocytes promotes inflammatory responses
• Microglial toxicity: TNFR1-mediated inflammation contributes to non-cell autonomous damage
• Disease progression: TNFR1 levels correlate with disease severity

Stroke and Traumatic Brain Injury

TNFR1 mediates secondary neuronal damage:

• Ischemic injury: [TNF-α](/proteins/tnf-alpha-protein)/TNFR1 signaling exacerbates ischemic brain damage
• Excitotoxicity: TNFR1 synergizes with glutamate toxicity
• [Blood-brain barrier](/entities/blood-brain-barrier) disruption: TNFR1 contributes to BBB breakdown

Therapeutic Targeting

TNFR1 is a major drug target for neuroinflammatory disorders:

• TNF-α inhibitors: Etanercept (Enbrel), Infliximab (Remicade), Adalimumab (Humira)
• TNFR1 antagonists: Soluble receptors and blocking antibodies
• Signaling inhibitors: [NF-κB](/entities/nf-kb) and MAPK pathway inhibitors
• Challenges: Systemic TNF inhibition causes immunosuppression
• Brain-penetrant drugs: Newer approaches aim to target CNS TNFR1 selectively

See Also

• [TNFRSF1A Gene](/genes/tnfrsf1a)

External Links

• [UniProt: P19438](https://www.uniprot.org/uniprot/P19438)
• [PDB structures](https://www.rcsb.org/search?q=uniprot:P19438)
• [GeneCards: TNFRSF1A](https://www.genecards.org/cgi-bin/carddisp.pl?gene=TNFRSF1A)

References